My Computer only turns on by turning my Power Supply on and off repeatedly

Is this a problem? I built my computer over the summer, and after a few weeks of use, my computer won't turn on by pressing the power button. ONLY sometimes, but rarely. The only way I can turn my computer on is by turning the power supply on/off continuously until I actually see the LED on my fans. Also I've had another problem. After a power surge, my computer started to freeze randomly at random times. Nothing would work (not even CTRL+ALT+DELETE, or anything else) and all you can hear is a low buzzing noise. The only way I could get rid of the freeze is turning off the computer using my working power button. Is this a power supply's problem? I may think of getting a new one soon. But I want to make sure its the power supply, not anything else.

PC Specs:
Intel i5 4670k

Z87-G41 PC Mate (MSI)

Sapphire Radeon hd 7870

Rosewill Case

HEC 850W Power Supply - 80+ Silver (HEC-850TS)

2TB 7,200 RPM SATA 6.0Gb/s Desktop 3.5" Internal Hard Drive PH3200U-1I72

8GB (2x4gb) Corsair Vengeance
5 answers Last reply Best Answer
More about computer turns turning power supply repeatedly
  1. Definitely a problem....I wouldn't rule out the motherboard either.
  2. PSU? A word to the wise, get rid of that piece of crap before it takes out your entire rig.

    This is all you need=
  3. Do you think 600w is enough? So its the power supply's problem, not anything else?
  4. Best answer
    It comes with a solid 46amp 12v rail & will run your 7870 all day. MSI has a history of temperamental board problems, but we will never know if that is the case or not (probably not) until you have a reliable psu running your rig.
  5. Thanks a lot you guys! I'll probably see if I can get one tomorrow and see how that turns out
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